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Version: v1.9

Version Control for Definitions

When an OAM definition is updated, KubeVela will automatically generate a new revision of this definition.

To list the revisions of the webservice Component, run:

$ vela def get webservice --revisions
NAME        REVISION    TYPE        HASH            
webservice  1           Component   dfa072dac5088ed8
webservice  2           Component   519e11eb7cbe9cdd

To list the revisions of the affinity Trait, run:

$ vela def get affinity --revisions  
NAME            REVISION        TYPE    HASH            
affinity        1               Trait   9db54dd8d5314bd5
affinity        2               Trait   8bf3e82a6884db2c

To list the revisions of the override Policy, run:

$ vela def get override --revisions
NAME            REVISION        TYPE    HASH
override        1               Policy  f6f87a5eb2271b8a

Note: there is only one revision of a definition if the definition has never been updated

To list the revisions of the deploy WorkflowStep, run:

$ vela def get deploy --revisions
NAME    REVISION        TYPE            HASH
deploy  1               WorkflowStep    2ea741dae457850b

Specifing a Specific Definition Revision in an Application​

Users can specify the revision of a definition they would like to use by specifying definition types in the form <definition-name>@<definition-revision>.

For example, if a user wanted to use the v3 revision of webservice Component, they would use webservice@v3 as the type in their component specification.

apiVersion: core.oam.dev/v1beta1
kind: Application
metadata:
  name: myapp
spec:
  components:
  - name: express-server
    type: webservice@v3
    properties:
      image: stefanprodan/podinfo:4.0.3

This ensures that if an administrator of your KubeVela instance modifies the webservice definition, your application will not be affected.

If no revision is specified for a definition, KubeVela will use the latest revision available at evaluation time. This will usually be the next time you upgrade your application.

tip

Cluster administrators can create admission webhooks that will set a definition revision if the field is not set